Load testing machine with calibration device

Abstract

The present invention provides a load testing machine with a calibration device that can reduce the influence of lateral resonance in the calibration state on the detection of load in the excitation direction. [Solution] The load testing machine with a calibration device 1 comprises a load application unit 11, a load detection unit 12, a calibration device 13, a load receiving member 14 that receives the calibration load and transmits it to the load detection unit, and an intermediary member 15 that mediates the indirect transmission of the calibration load from the calibration device 13 to the load receiving member 14, with both the load receiving member 14 and the calibration device 13 being opposing members and facing each opposing member with a convex curved surface 151. One opposing member (load receiving member 14) is provided with a flat surface 14a that the convex curved surface 151 abuts against, and the other opposing member (calibrator 13) is provided with a concave curved surface 136a-1 into which the convex curved surface 151 fits.

Description

【Technical Field】 【0001】 The present invention relates to a loading test machine with a tester, which is provided with a tester set in place of a specimen for testing work. 【Background Art】 【0002】 Conventionally, a loading test machine that applies a test load to a specimen, such as vibration isolation rubber used for a vehicle engine mount, to examine dynamic characteristics has been widely used. In such a loading test machine, in many cases, testing work is performed for the purpose of confirming whether the machine meets predetermined standard performance at various timings such as at the time of shipment, at the time of installation at the destination, at the time of transfer, and at the time of regular inspection. In this testing work, a tester that is designed in advance to exhibit predetermined dynamic characteristics and is set on the loading test machine instead of the specimen is often used (see, for example, Patent Document 1). In the test state where the tester is set on the loading test machine, a predetermined test load is applied to the tester as a test load. Then, the load transmitted from the tester according to this test load is detected as a test load. The performance of the loading test machine is confirmed by comparing the detection result with the designed dynamic characteristics of the tester. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent No. 7775521 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In a load-bearing tester equipped with the above-described calibration device, the calibration load from the calibration device is transmitted to the load detection unit via a spherical intermediary member during calibration. This spherical intermediary member is mounted such that its convex surface fits into the concave surface of the calibration device and the concave surface of the load-receiving member attached to the load detection unit. With such a mounting structure, lateral forces are more easily transmitted to the load detection unit via the intermediary member. As a result, at high frequencies (above 1 kHz) where the lateral resonance inherent in the structure of the load-bearing tester is amplified by the vibration, the lateral force generated from the lateral vibration can affect the load detection in the vibration direction by several percent, potentially causing errors in the measured dynamic spring value. In addition, variations in the degree and frequency of lateral resonance can lead to poor reproducibility of the dynamic spring value of the calibration device. On the other hand, it is difficult to eliminate (or raise to 3 kHz or higher) lateral resonance points in load testing machines, and it is also difficult to consistently and precisely fit the convex curved surface of the intermediary member to the concave curved surface of the calibration device or load-bearing member. Any misalignment in the fit makes lateral resonance even more likely to occur. 【0005】 The object of the present invention is to provide a load testing machine with a calibration device that can reduce the influence of lateral resonance in the calibration state on load detection in the excitation direction. [Means for solving the problem] 【0006】 To solve the above problems, the load testing machine with a calibration device includes: a load application unit that applies a test load in a predetermined loading direction; a load detection unit that holds a test specimen between itself and the load application unit in the loading direction and measures the load transmitted from the test specimen that has received the test load; a calibration device that, in a calibration state set in place of the test specimen, causes the load application unit to detect the load when it applies a predetermined calibration load as the test load as the calibration load in the load detection unit; a load receiving member attached to the side of the calibration device in the load detection unit in the calibration state, which receives the calibration load and transmits it to the load detection unit; and at least one of the load receiving member and the calibration device is an opposing member, and the opposing member is The present invention provides an intermediary member, which is formed separately and, in the verification state, interposes between the load-receiving member and the verification device with a convex curved surface constituting a part of the spherical surface facing the opposing member, thereby mediating the indirect transmission of the verification load from the verification device to the load-receiving member, wherein, when the opposing member is only one of the load-receiving member and the verification device, the opposing member as one of the members is provided with a flat surface that the convex curved surface directly contacts or indirectly contacts with the intermediary member, and when the opposing member is both the load-receiving member and the verification device, one of the opposing members is provided with the flat surface, and the other opposing member is provided with a concave curved surface into which the convex curved surface fits. 【0007】 According to the above-described load testing machine with a calibration device, the structure is such that a convex curved surface and a flat surface are in point contact between the intermediate member and the opposing member, thus minimizing the transmission of lateral forces to the intermediate member and the opposing member. In other words, the transmission of lateral resonance forces in the calibration state using the calibration device is minimized. Furthermore, since the lateral force is effectively dissipated at the point contact point, a reduction in the occurrence of lateral resonance itself in the calibration state can be expected, and as a result, the reproducibility of the dynamic spring value of the calibration device can be improved. Moreover, in the above-described point contact, unlike the case where a convex curved surface is tightly fitted to a concave curved surface, slight positional misalignment between the intermediate member and the opposing member has almost no effect on the transmission of forces between them, and in this respect as well, the effect of lateral resonance can be reduced. Thus, according to the above-described load testing machine with a calibration device, the influence of lateral resonance in the calibration state on the detection of the excitation direction can be reduced. 【0008】 In this case, it is preferable that the flat surface is a hardened surface that is harder than the interior of the opposing member on which the flat surface is provided, and the convex curved surface that abuts against the flat surface. 【0009】 With this configuration, by making the flat surface a hardened surface, indentations and other defects that occur during point contact with a convex curved surface can be suppressed, and the flat state can be effectively maintained. 【0010】 Furthermore, it is preferable that the opposing member on which the flat surface is provided has a projection that protrudes toward the convex curved surface, and that the flat surface is provided on the side of the projection that faces the convex curved surface. 【0011】 With this configuration, the area where the flat surface is formed is limited to the side facing the convex curved surface of the protrusion, so the cost of processing the flat surface can be reduced compared to the case where the entire side facing the convex curved surface of the opposing member is made flat. 【0012】 Furthermore, the device further comprises a sheet member formed in a sheet shape from a material more flexible than both the flat surface and the convex curved surface, and it is preferable that the convex curved surface indirectly contacts the flat surface by sandwiching the sheet member between it and the flat surface as an intervening object. 【0013】 With this configuration, by interposing a flexible sheet member between the flat surface and the convex curved surface, indentations in the flat surface during point contact with the convex curved surface can be suppressed, and the flat state can be effectively maintained. 【0014】 Furthermore, it is preferable that the intermediary member is a spherical member formed separately from both the load-receiving member and the testing device, such that in the testing state, a portion of its surface becomes a contact convex curved surface that directly or indirectly contacts the flat surface, and another portion becomes a fitting convex curved surface that fits into the concave curved surface. 【0015】 This configuration allows for improved workability regarding the installation of the intermediate member by making it a separate spherical member from both the load-bearing member and the calibration device, compared to when the intermediate member is integrated with either member. Furthermore, the spherical member acting as the intermediate member can be stably installed by fitting the concave and convex surfaces together, while reducing the effects of lateral resonance through point contact between the flat surface and the convex surface. 【0016】 Furthermore, it is preferable that the load-applying portion is formed in a columnar shape having an axis along the loading direction, with one end face being a set surface on which the test specimen or the calibration device is set, and further comprises a first acceleration sensor that can be attached to any position on the set surface, including a first mounting position intersecting the axis, for measuring acceleration when a dynamic load is applied, and a second acceleration sensor that is attached to a second mounting position located on the axis inside the columnar portion away from the set surface, for measuring acceleration when the dynamic load is applied. 【0017】 In this configuration, the acceleration when a dynamic load is applied is measured by a first acceleration sensor and a second acceleration sensor mounted at positions separate from each other. Here, the user of the test machine can measure acceleration using the first acceleration sensor at any position other than the position of the second acceleration sensor built into the test machine. In other words, the degree of freedom in the placement of the first acceleration sensor can be increased. At this time, separate from the measurement at the arbitrary position, by placing the first acceleration sensor at the first mounting position described above and measuring acceleration with the first and second acceleration sensors positioned on their axes, the following verification of the state of each sensor can be performed. That is, in this state, since both the first and second acceleration sensors are positioned on their axes along the direction of load application, it is possible to verify whether there is a difference between the measurement results of the two sensors and to detect sensor failures. 【0018】 Furthermore, the load-applying portion is formed in an annular shape and mounted on the set surface of the columnar portion such that the center of the ring is located on the axis, and the mounting member further comprises a mounting surface on which the test specimen or the calibration device is mounted, wherein the mounting surface of the mounting member has a wire guide groove formed in the shape of a groove from the inner edge to the outer edge, and when the first acceleration sensor is mounted in a position where the sensor wire extending from the first acceleration sensor passes inside the mounting member, the wire guide groove is formed to house the sensor wire inside the groove and guide it to the outside of the mounting member. 【0019】 This configuration allows for greater flexibility in the placement of test specimens and calibration devices compared to when the test specimens and calibration devices are placed directly on the set surface of the columnar section, by providing a mounting member. Furthermore, with this configuration, the sensor wires from the first acceleration sensor mounted at the aforementioned position are guided through the inside of the annular mounting member and the wire guide groove to the outside of the mounting member, thus minimizing the impact of the sensor wire routing on the mounting of the calibration device. [Effects of the Invention] 【0020】 According to the above-mentioned loading testing machine with a calibrator, the influence of lateral resonance in the calibration state on the load detection in the vibration direction can be reduced. 【Brief Description of the Drawings】 【0021】 [Figure 1] It is a schematic diagram showing a loading testing machine with a calibrator according to an embodiment. [Figure 2] It is a diagram showing an enlarged view of the load transmission member shown in FIG. 1. [Figure 3] It is a plan view of the load receiving member shown in FIG. 1 as viewed from the direction of the flat surface where the convex curved surface of the intermediate member abuts. [Figure 4] It is a plan view showing the sheet member sandwiched between the contact convex curved surface of the intermediate member and the flat surface of the load receiving member together with the load receiving member shown in FIG. 3. 【Modes for Carrying Out the Invention】 【0022】 Hereinafter, a loading testing machine with a calibrator according to an embodiment of the present invention will be described. 【0023】 FIG. 1 is a schematic diagram showing a loading testing machine with a calibrator according to an embodiment. 【0024】 The loading testing machine 1 with a calibrator in this embodiment is a device used for a load loading test that applies a compressive or tensile load to a specimen (not shown) as a load to obtain the dynamic characteristics and static characteristics of the specimen. Here, the specimen is a rubber product such as an engine mount rubber, which is one of the automotive parts. Also, one of the characteristics to be obtained is the spring constant of such a rubber product. In the vibration test for obtaining dynamic characteristics, a test load is applied to the specimen to obtain the dynamic spring constant (dynamic spring value), and in the static test for obtaining static characteristics, a constant load is applied to the specimen to obtain the static spring constant (static spring value). Hereinafter, the loading testing machine 1 with a calibrator will be described focusing on the vibration test for obtaining dynamic characteristics. 【0025】 The load testing machine 1 with a calibration device shown in Figure 1 comprises a load application unit 11, a load detection unit 12, a calibration device 13, a load receiving member 14, an intermediary member 15, a sheet member 16, a first acceleration sensor 17, and a second acceleration sensor 18. 【0026】 The load application unit 11 is a member that applies a test load in a predetermined loading direction D11, and has a columnar portion 111 and a mounting member 112. The load and operation generated by a load generating unit (not shown) are transmitted to the load application unit 11. The load generating unit can be an electrodynamic actuator (electrodynamic vibrator), a linear motor actuator (linear motor vibrator), a hydraulic actuator (hydraulic vibrator), etc. The columnar portion 111 is formed in a hollow cylindrical shape having an axis X11 along the loading direction D11, and one end face is a setting surface 111a on which the test specimen or the calibration device 13 is set. In addition, a sensor mounting recess 111b is formed in the center of this setting surface 111a on which the first acceleration sensor 17 is housed and mounted when verifying the sensor state, as described later. The mounting member 112 is formed in an annular shape and is mounted on the setting surface 111a of the columnar portion 111 such that the center of the ring is located on the axis X11, and the test specimen or calibration device 13 is mounted on the mounting surface 112a opposite to the setting surface 111a. The mounting member 112 is fastened and fixed to the setting surface 111a of the columnar portion 111 by mounting screws 112b. 【0027】 The load detection unit 12 is a part that holds the test specimen or calibration device 13 between itself and the load application unit 11 in the loading direction D11, and measures the load transmitted from the test specimen or calibration device 13 that has been subjected to the test load. This load detection unit 12 comprises a support column 121, a receiving side holding part 122, and a load sensor 123. The support column 121 is a columnar part fixed to an upper structure (not shown), and holds the receiving side holding part 122 at its tip. The receiving side holding part 122 is a part that holds the test specimen or calibration device 13 between itself and the columnar part 111 of the load application unit 11, and the load sensor 123 is attached to a position opposite to the test specimen or calibration device 13 in the loading direction D11. The load sensor 123 is a sensor that measures the load transmitted from the test specimen or calibration device 13, and multiple sensors are attached to the above position on the receiving side holding part 122. In static tests, the load sensor 123 measures the static load generated along the axis X11 on the test specimen or calibration device 13 due to compressive or tensile loads. In such static tests, the amount of displacement applied to the test specimen or calibration device 13 is measured not by the acceleration sensor described later, but by a separate displacement sensor (not shown), such as a linear encoder. In vibration tests, the load sensor 123 measures the dynamic load generated along the axis X11 on the test specimen or calibration device 13 due to the test load. 【0028】 The calibration device 13 is a device that, in a calibration state set in place of a test specimen, causes the load applied by the load application unit 11 as a predetermined calibration load to be detected by the load detection unit 12 as the calibration load. This calibration device 13 comprises a leaf spring member 131, a first annular member 132, a second annular member 133, a first screw 134, a second screw 135, and a load transmission member 136. 【0029】 The leaf spring member 131 is a circular plate member made of stainless steel that is elastically deformable in the thickness direction. Furthermore, the surface of this leaf spring member 131 is treated with a rust-preventive coating, for example, by an electroplating method. 【0030】 The first annular member 132 is an aluminum member formed in an annular shape with an outer diameter approximately the same as that of the leaf spring member 131, and is set on the setting surface 111a of the columnar portion 111 in the load-applying section 11 via an annular mounting member 112. That is, it is set on the setting surface 111a of the columnar portion 111 with the mounting surface 112a of the mounting member 112 mounted on it. This setting is performed so that the central axis X111 of the annular ring of the first annular member 132 coincides with the axis X11 of the load-applying section 11. In the above-mentioned verification state, a portion of the outer circumference of the leaf spring member 131 is superimposed on the upper surface 132a of the first annular member 132, which faces the load detection section 12. 【0031】 The second annular member 133 is an aluminum member formed in an annular shape with the same diameter and width as the first annular member 132, so as to sandwich the outer circumference of the leaf spring member 131 between it and the first annular member 132. The second annular member 133 is fixed coaxially to the first annular member 132 with the leaf spring member 131 sandwiched between them. 【0032】 The first screw 134 is a fastening member that fastens and fixes the first annular member 132 to the set surface 111a of the columnar portion 111 in the load-applying portion 11. The first annular member 132, the leaf spring member 131, the second annular member 133, and the mounting member 112 have through holes 132c, 131a, 133a, and 112d that communicate with each other and through which the first screw 134 passes in a one-to-one manner. In addition, the set surface 111a of the columnar portion 111 has a first screw hole 111c that communicates with these through holes 132c, 131a, 133a, and 112d. The first screw 134 fastens and fixes the components as described above by passing through the through holes 132c, 131a, 133a, and 112d, which are arranged in a communicating state, and by screwing into the first screw hole 111c in the load-applying portion 11. 【0033】 The second screw 135 is a fastening member that fastens and fixes the second annular member 133 to the first annular member 132. Through holes 133a and 131a are formed on the outer circumference of the second annular member 133 and the leaf spring member 131, through which the second screw 135 penetrates in a one-to-one correspondence with the first screw 134 at positions offset in the circumferential direction. In addition, the first annular member 132 has a second screw hole 132b that communicates with these through holes 133a and 131a. Each second screw 135 fastens and fixes the members as described above by passing through the communicating through holes 133a and 131a and screwing into the second screw hole 132b in the first annular member 132. 【0034】 The load transmission member 136 is attached to the central part of the leaf spring member 131 and transmits the load transmitted from the leaf spring member 131 to the load detection unit 12 as a test load according to the test load. 【0035】 Figure 2 is an enlarged view of the load transmission member shown in Figure 1. 【0036】 The load transmission member 136 comprises a first transmission member 136a, a second transmission member 136b, a third screw 136c, and a reamer bolt 136d. 【0037】 The first transmission member 136a is a small-diameter circular plate member made of aluminum, which is superimposed on the central part of the leaf spring member 131 on the surface facing the load detection unit 12 in the test state, and which has a predetermined gap between it and the inner edge of the second annular member 133. 【0038】 The second transmission member 136b is a circular plate member made of aluminum, with approximately the same diameter as the first transmission member 136a, which is superimposed on the central part of the leaf spring member 131, with the surface facing the load application part 11 in the test state, sandwiching the leaf spring member 131 between it and the first transmission member 136a. 【0039】 The third screw 136c is attached from the side facing the load application section 11 in the test state and is a fastening member that fastens and fixes the second transmission member 136b to the first transmission member 136a. The second transmission member 136b and the leaf spring member 131 have through holes 136b-1 and 131c formed therein, through which the third screw 136c passes in a one-to-one manner. The first transmission member 136a also has a third screw hole 136a-2 formed therein, which communicates with these through holes 136b-1 and 131c. The third screw 136c fastens and fixes the first transmission member 136a by passing through the through holes 136b-1 and 131c, which are arranged in a communicating state, and by screwing into the third screw hole 136a-2 in the first transmission member 136a. 【0040】 The reamer bolt 136d, together with the third screw 136c, is a component that fastens and fixes the second transmission member 136b to the first transmission member 136a. Through holes 136b-2 and 131d are formed in the center of the second transmission member 136b and the center of the leaf spring member 131, through which the cylindrical portion 136d-1 below the neck of the reamer bolt 136d passes. Furthermore, a recess 136a-3 is formed in the center of the first transmission member 136a, communicating with these through holes 136b-2 and 131d, extending to a position midway in the thickness direction, and a screw hole 136a-4 for the reamer bolt is formed from the bottom of this recess 136a-3. The shank-mounted cylindrical portion 136d-1 of the reamer bolt 136d penetrates the through holes 136b-2 and 131d of the second transmission member 136b and the leaf spring member 131 with a fit tolerance smaller than the positional misalignment tolerance of the third screw 136c. In the inspection state, the reamer bolt 136d, from the side facing the load application portion 11, has its shank-mounted cylindrical portion 136d-1 pass through the through holes 136b-2 and 131d as described above, entering the recess 136a-3 of the first transmission member 136a, and its tip threaded portion 136d-2 is screwed into the reamer bolt threaded hole 136a-4 at the point of entry. The screwing in of the tip threaded portion 136d-2 of the reamer bolt 136d fastens and fixes the second transmission member 136b to the first transmission member 136a. 【0041】 Next, the load-receiving member 14 shown in Figure 1 is attached to the surface of the receiving-side holding part 122 of the load detection unit 12 on the side of the tester 13 by fastening and fixing with a load-receiving screw 141 in the test state using the tester 13 described above. The load-receiving member 14 has a through hole 143 through which the load-receiving screw 141 passes, and the receiving-side holding part 122 has a load-receiving screw hole 122a that communicates with this through hole 143. The load-receiving screw 141 fastens and fixes by passing through the through hole 143 in the load-receiving member 14 and screwing it into the load-receiving screw hole 122a in the receiving-side holding part 122. This load-receiving member 14 is a member that receives the test load from the tester 13 and transmits it to the load detection unit 12. 【0042】 The intermediary member 15 is a member that interposes between the load-receiving member 14 and the inspector 13 during the inspection process, thereby mediating the indirect transmission of the inspection load from the inspector 13 to the load-receiving member 14. This intermediary member 15 is formed separately from at least one of the load-receiving member 14 and the inspector 13, which are opposing members having surfaces facing each other. In this embodiment, both the load-receiving member 14 and the inspector 13 are opposing members, and the intermediary member 15 is a spherical member formed spherically separately from both of these members. The intermediary member 15 interposes between the load-receiving member 14 and the inspector 13, with two convex curved surfaces 151, each constituting a part of the spherical surface, facing the load-receiving member 14 and the inspector 13, respectively, as opposing members. 【0043】 Here, the load-receiving member 14, which is one of the two opposing members to which the two convex curved surfaces 151 of the intermediary member 15 abut, is provided with a flat surface 14a to which one of the convex curved surfaces 151 directly abuts, or to which it abuts indirectly with an intervening object in between. 【0044】 Figure 3 is a plan view of the load-bearing member shown in Figure 1, viewed from the direction of the flat surface to which the convex curved surface of the intermediary member abuts. 【0045】 As shown in Figures 1 and 3, the flat surface 14a of the load-bearing member 14 is a circular surface located in the center of the circular block-shaped load-bearing member 14. In this embodiment, the load-bearing member 14 has a cylindrical projection 142 that protrudes toward the convex curved surface of the intermediary member 15, and the flat surface 14a is provided on the side of the projection 142 that faces the convex curved surface 151. This flat surface 14a is a smooth surface with less surface roughness than other outer surfaces of the load-bearing member 14, for example, by mirror finishing. Furthermore, this flat surface 14a is hardened by heat treatment applied to the entire load-bearing member 14, so that it, along with the other outer surfaces of the load-bearing member 14, is a hardened surface that is harder than the interior of the load-bearing member 14. In addition, the hardness of this hardened flat surface 14a is harder than the convex curved surface 151 that abuts against the flat surface 14a. 【0046】 Furthermore, in the calibration device 13, which, along with the load-receiving member 14 provided with a flat surface 14a, is a spherical member acting as an intermediary member 15, is a counter member for the convex curved surface 151. In this device, a concave curved surface 136a-1 is provided on the first transmission member 136a into which the convex curved surface 151 fits. As shown in Figure 1, this concave curved surface 136a-1 is formed in the center of the surface of the first transmission member 136a facing the load detection unit 12 in the calibration state, corresponding to the convex curved surface 151, and forming part of the concave spherical surface. The intermediary member 15, which is a spherical member, has a contact convex curved surface 151a on one side that abuts against the flat surface 14a, and another side that fits into the concave curved surface 136a-1, forming a fitting convex curved surface 151b. In this embodiment, the contact between the convex curved surface 151a of the intermediary member 15 and the flat surface 14a of the load-receiving member 14 is indirect, with the sheet member 16 acting as an intermediary in between. 【0047】 Figure 4 is a plan view showing the sheet member sandwiched between the contact convex curved surface of the intermediary member and the flat surface of the load-bearing member, together with the load-bearing member also shown in Figure 3. In Figure 4, the load-bearing member 14 and the sheet member 16 are shown with the same direction as the front direction D12 in Figure 3 as the front direction D12. 【0048】 The sheet member 16 is a rectangular sheet-shaped member made of a material more flexible than both the flat surface 14a of the load-receiving member 14 and the contact convex curved surface 151a of the intermediary member 15. One example of this sheet member 16 is a sheet made of synthetic resin such as polyethylene with a thickness of approximately 0.06 to 0.1 mm. The contact convex curved surface 151a of the intermediary member 15 indirectly contacts the flat surface 14a of the load-receiving member 14 by sandwiching the sheet member 16 between it and the flat surface 14a as an intermediary. 【0049】 Next, the first acceleration sensor 17 and the second acceleration sensor 18 shown in Figure 1 will be described. 【0050】 The first acceleration sensor 17 is a sensor that can be mounted at any position on the set surface 111a of the columnar portion 111 of the load application unit 11, including a first mounting position P11 that intersects with the axis X11. The first acceleration sensor 17 measures the acceleration when a dynamic load is applied at any of its mounted positions. The first mounting position P11 is located inside the sensor mounting recess 111b, which is provided in the center of the set surface 111a as described above. This first mounting position P11 is the position where the first acceleration sensor 17 is mounted when verifying the sensor state of the first acceleration sensor 17 and the second acceleration sensor 18, but it can also be used as the mounting position for the first acceleration sensor 17 for actual testing. When mounted at the first mounting position P11, the first acceleration sensor 17 is housed in the sensor mounting recess 111b and fixed to the bottom surface of this sensor mounting recess 111b. 【0051】 Here, the load application unit 11 is provided with an annular mounting member 112 that is mounted on the setting surface 111a of the columnar portion 111 as described above, and on the mounting surface 112a on which the test specimen or calibration device 13 is mounted. A wire guide groove 112c is formed on the mounting surface 112a of this mounting member 112 to guide the sensor wire 171 extending from the first acceleration sensor 17. This wire guide groove 112c is formed in a groove shape on the mounting surface 112a of the mounting member 112 from the inner edge to the outer edge, and guides the sensor wire 171, which extends from the first acceleration sensor 17 and passes inside the mounting member 112, to the outside of the mounting member by keeping it inside the groove. The wire guide groove 112c is used as a routing path for the sensor wire 171 when the first acceleration sensor 17 is mounted at a position where the sensor wire 171 passes inside the mounting member 112, such as the first mounting position P11 described above or the inner surface of the mounting member 112. 【0052】 The second acceleration sensor 18 is mounted at a second mounting position P12 located on the axis X11, inside the columnar portion 111 of the load application unit 11, away from the set surface 111a, and measures the acceleration when a dynamic load is applied. This second acceleration sensor 18 is mounted on the top surface 111e of the internal cavity 111d provided in the columnar portion 111 via a sensor mounting member 181. First, the sensor mounting member 181 is fastened and fixed to the top surface 111e of the internal cavity 111d by an external sensor mounting screw 182 that is inserted from the bottom surface of the sensor mounting recess 111b through a through hole in the ceiling wall. Then, the second acceleration sensor 18 is fastened and fixed to this sensor mounting member 181 by an internal sensor mounting screw 183. 【0053】 In the load testing machine 1 with a calibration device described above, the intermediary member 15 and the load-receiving member 14, which acts as the opposing member, are in point contact with each other, with a convex curved surface 151 and a flat surface 14a. This minimizes the transmission of lateral forces to the intermediary member 15 and the load-receiving member 14. In other words, the transmission of lateral resonance forces in the calibration state using the calibration device 13 is minimized. Furthermore, since the lateral force is effectively dissipated at the point contact, a reduction in the occurrence of lateral resonance in the calibration state can be expected, and as a result, the reproducibility of the dynamic spring value of the calibration device 13 can be improved. Moreover, in the above point contact, unlike the case where the convex curved surface is tightly fitted to the concave curved surface provided on the load-receiving member, slight positional misalignment between the intermediary member 15 and the opposing member has almost no effect on the transmission of forces between them, and in this respect as well, the effect of lateral resonance can be reduced. Thus, according to this embodiment, the influence of lateral resonance in the calibration state on the detection of the excitation direction can be reduced. 【0054】 In this embodiment, the flat surface 14a is a hardened surface that is harder than the interior of the opposing member (load-receiving member 14) on which the flat surface 14a is provided, and also harder than the convex curved surface 151 that contacts the flat surface 14a. With this configuration, by making the flat surface 14a a hardened surface, indentations and the like during point contact with the convex curved surface 151 can be suppressed, and the flat state can be effectively maintained. 【0055】 Furthermore, in this embodiment, a projection 142 is formed on the opposing member (load-receiving member 14) which has a flat surface 14a, and the flat surface 14a is provided on the side of the projection 142 that faces the convex curved surface 151. With this configuration, the area in which the flat surface 14a is formed is limited to the side of the projection 142 that faces the convex curved surface 151. As a result, compared to the case where the entire side facing the convex curved surface of the opposing member without a projection is made flat, surface processing such as mirror finishing of the flat surface 14a, which tends to be costly, becomes easier. In addition, processing such as mirror finishing only needs to be applied to the projection 142, so processing costs can be reduced. 【0056】 Furthermore, in this embodiment, the convex curved surface 151 indirectly contacts the flat surface 14a by sandwiching a sheet member 16, which is more flexible than either of the two surfaces, between it and the flat surface 14a. With this configuration, by interposing the flexible sheet member 16 between the flat surface 14a and the convex curved surface 151, indentations in the flat surface 14a during point contact with the convex curved surface 151 can be suppressed, and the flat state can be effectively maintained. 【0057】 Furthermore, in this embodiment, the intermediary member 15 is a spherical member separate from both the load-receiving member 14 and the calibration device 13. A portion of the surface of the spherical member becomes a contact convex curved surface 151a that abuts against the flat surface 14a of the load-receiving member 14, and another portion becomes a fitting convex curved surface 151b that fits into the concave curved surface 136a-1 of the calibration device 13. With this configuration, by making the intermediary member 15 a spherical member separate from both the load-receiving member 14 and the calibration device 13, workability regarding the installation of the intermediary member 15 can be improved compared to when the intermediary member 15 is integrated with either member. Moreover, the spherical member as the intermediary member 15 can be stably installed by fitting the concave curved surface 136a-1 and the convex curved surface 151, while reducing the effects of lateral resonance through point contact between the flat surface 14a and the convex curved surface 151. 【0058】 Furthermore, in this embodiment, the first acceleration sensor 17 can be mounted at any position on the set surface 111a of the columnar portion 111 provided in the load application section 11, including the first mounting position P11 which intersects with the axis X11. In addition, the second acceleration sensor 18 is mounted at a second mounting position P12 located on the axis X11, inside the columnar portion 111, away from the set surface 111a. With this configuration, the acceleration when a dynamic load is applied is measured by the first acceleration sensor 17 and the second acceleration sensor 18, which are mounted at positions far apart from each other. Here, the user of the test machine can measure the acceleration using the first acceleration sensor 17 at any position other than the position of the second acceleration sensor 18 built into the test machine. At this time, separate from the measurement at that arbitrary position, by placing the first acceleration sensor 17 at the first mounting position P11, the state of each sensor can be verified as follows. In other words, when the first acceleration sensor 17 is positioned at the first mounting position P11, both the first acceleration sensor 17 and the second acceleration sensor 18 are located on the axis X11 along the load direction D11. In this state, by measuring acceleration with the two acceleration sensors, it is possible to verify whether there is a difference between the measurement results of the two sensors and to detect sensor failures. Needless to say, the first mounting position P11 can be used not only for such verification but also as the mounting position for the first acceleration sensor 17 during actual testing. 【0059】 Furthermore, in this embodiment, the load application unit 11 is provided with an annular mounting member 112 that is mounted on the setting surface 111a of the columnar portion 111, and on the mounting surface 112a opposite to the setting surface 111a, on which the test specimen or calibration device 13 is mounted. The mounting surface 112a has a wire guide groove 112c formed in a groove shape from the inner edge to the outer edge, which guides the sensor wire 171 extending from the first acceleration sensor 17 and passing through the inside of the mounting member 112 to the outside of the mounting member 112 by housing it inside the groove. With this configuration, by providing the mounting member 112, the degree of freedom in setting the test specimen or calibration device 13 can be increased compared to when the test specimen or calibration device is placed directly on the setting surface of the columnar portion. Furthermore, according to the above configuration, if the first acceleration sensor 17 is mounted in a position where the sensor wire 171 passes inside the mounting member 112, the sensor wire 171 is guided through the inside of the annular mounting member 112 and the wire guide groove 112c to the outside of the mounting member 112. This makes it possible to suppress the influence of the routing of the sensor wire 171 on the mounting of the calibration device 13. 【0060】 Furthermore, the embodiments described above are merely representative forms of the present invention, and the present invention is not limited thereto. That is, it can be implemented with various modifications without departing from the core principles of the present invention. As long as such modifications still possess the configuration of the load testing machine with a calibration device of the present invention, they are of course included within the scope of the present invention. 【0061】 For example, in the embodiment described above, a load testing machine with a calibration device 1 is shown as an example, using a rubber product such as an engine mount rubber, which is a type of automobile part, as the test specimen. However, load testing machines with calibration devices are not limited to this, and can be used to test specimens of any material, not just such rubber products. 【0062】 Furthermore, in the embodiments described above, a load testing machine with a calibration device 1 that performs both static and vibration tests is exemplified as an example of a load testing machine with a calibration device. However, the load testing machine with a calibration device is not limited to this, and may perform only vibration tests. 【0063】 Furthermore, in the above-described embodiment, as an example of a load-bearing tester with a calibration device, a load-bearing tester with a calibration device 1 is provided in which both the load-bearing member 14 and the calibration device 13 are opposing members to the convex curved surface 151 of the intermediary member 15, and the intermediary member 15 is formed separately from both of these. However, load-bearing testers with calibration devices are not limited to this. A load-bearing tester with a calibration device may have only one of the load-bearing member and the calibration device as an opposing member, with the intermediary member formed separately from that opposing member and integrally with the other member. In other words, a load-bearing tester with a calibration device only needs to have at least one of the load-bearing member and the calibration device as an opposing member, and the intermediary member formed separately from that opposing member. Also, when the intermediary member is formed separately from only one of the load-bearing member and the calibration device and integrally with the other member, it is possible to arbitrarily select which member to integrate with the intermediary member. 【0064】 Furthermore, in the embodiments described above, as an example of a flat surface provided on the opposing member, a flat surface 14a that is a hardened surface harder than the interior and convex curved surface 151 of the opposing member (load-receiving member 14) is exemplified. However, the flat surface is not limited to this, and may be a surface with the same hardness as the interior of the opposing member. However, as mentioned above, making the flat surface 14a a hardened surface allows for effective maintenance of the flat state. 【0065】 Furthermore, in the embodiments described above, an example of an opposing member having a flat surface is shown as an opposing member (load-receiving member 14) having a projection 142 formed thereon, and a flat surface 14a provided on the side of the projection 142 facing the convex curved surface 151. However, the opposing member is not limited to this, and the entire surface of the opposing member facing the convex curved surface may be used as the area for forming the flat surface. However, as mentioned above, by limiting the area for forming the flat surface 14a to the side of the projection 142 facing the convex curved surface 151, the processing cost for processing the flat surface 14a can be reduced. 【0066】 Furthermore, in the embodiments described above, an example of a load testing machine with a calibration device is provided in which the convex curved surface 151 of the intermediary member 15 indirectly contacts the flat surface 14a of the opposing member by sandwiching a sheet member 16 as an intermediary. However, the load testing machine with a calibration device is not limited to this, and the convex curved surface of the intermediary member may directly contact the flat surface of the opposing member. However, as described above, by interposing the sheet member 16 between the convex curved surface 151 and the flat surface 14a, the flat state of the flat surface 14a can be effectively maintained. 【0067】 Furthermore, in the above-described embodiment, a load testing machine with a calibration device is exemplified as an example of a load testing machine with a calibration device, in which the intermediate member 15 is an independent spherical member. In this example, a part of the surface of the intermediate member 15 becomes a contact convex curved surface 151a that abuts against the flat surface 14a, and another part becomes a fitting convex curved surface 151b that fits into the concave curved surface 136a-1 of the calibration device 13. However, the load testing machine with a calibration device is not limited to this, and the intermediate member may be formed integrally with either the load receiving member or the calibration device, with the other member being the opposing member to the convex curved surface and having a flat surface on that member. However, as mentioned above, by making the intermediate member 15 an independent spherical member, workability regarding the installation of the intermediate member 15 can be improved. Furthermore, as mentioned above, the intermediary member 15 can be stably installed by fitting the fitting convex curved surface 151b of the intermediary member 15 into the concave curved surface 136a-1 provided on an opposing member other than the side on which the flat surface 14a is formed. 【0068】 Furthermore, in the above-described embodiment, as an example of a load testing machine with a calibration device, a load testing machine with a calibration device 1 is provided, which is equipped with a first acceleration sensor 17 that can be mounted at any position on the axis X11, including a first mounting position P11. The load testing machine with a calibration device 1 is also equipped with a second acceleration sensor 18 mounted at a second mounting position P12 on the axis X11. However, the load testing machine with a calibration device is not limited to this, and any configuration can be adopted for mounting the acceleration sensor. However, as mentioned above, by making the first acceleration sensor 17 mountable at any position including the first mounting position P11, the degree of freedom regarding the sensor placement of the first acceleration sensor 17 can be increased. Furthermore, as mentioned above, by mounting the first acceleration sensor 17 at the first mounting position P11 and arranging it on the axis X11 together with the second acceleration sensor 18, it is possible to verify whether there is a difference in the measurement results between the two sensors and to detect sensor failures. 【0069】 Furthermore, in the above-described embodiment, as an example of a load-applying section, a load-applying section 11 is provided in which an annular mounting member 112 is provided on the setting surface 111a of the columnar section 111 on which a test specimen or a calibration device 13 is mounted. In this example, a wire guide groove 112c is formed on the mounting surface of the mounting member 112 to guide the sensor wire 171 extending from the first acceleration sensor 17 and passing through the inside of the mounting member 112 outwards. However, the load-applying section is not limited to this, and the test specimen or calibration device may be placed directly on the setting surface of the columnar section, and any configuration can be adopted for the routing of the sensor wire from the first acceleration sensor. However, as mentioned above, providing a mounting member 112 for the test specimen or calibration device 13 increases the degree of freedom regarding the installation of the test specimen or calibration device 13. Furthermore, as mentioned above, by routing the sensor wire 171 from the inside of the annular mounting member 112 into the wire guide groove 112c on the mounting surface 112a and guiding it outwards, the influence of the routing of the sensor wire 171 on the mounting of the calibration device 13 can be minimized. [Explanation of Symbols] 【0070】 1. Load testing machine with calibration device 11 Load application section 12 Load detection unit 13. Testing device 14 Load-bearing member 14a flat surface 15 Intermediary component 16 Sheet material 17. First Accelerometer 18. Second accelerometer 111 Columnar part 111a Setting surface 111b Sensor mounting recess 111c First screw hole 111d Internal cavity 111e Top section 112 Mounting components 112a Mounting surface 112b Mounting screws for the mounting section 112c Wire guide groove 112d,131a,131b,131c,131d,132c,133a,133b,136b-1,136b-2,143 Through hole 121 Pillar section 122 Receiving side holding part 122a Load-bearing screw hole 123 Load Sensor 131 Leaf spring component 132 First annular member 132a Top side 132b Second screw hole 133 Second annular member 134 First screw 135 Second thread 136 Load transmission member 136a First transmission member 136a-1 Concave curved surface 136a-2 Third threaded hole 136a-3 Recess 136a-4 Threaded hole for reamer bolt 136b Second transmission member 136c Third thread 136d Reamer bolt 136d-1 Cylindrical section below the neck 136d-2 Threaded tip 141 Load-bearing screws 142 Protrusion 151 Convex curved surface 151a Contact convex curved surface 151b Fitting convex curved surface 171 Sensor wire 181 Sensor mounting component 182 External sensor mounting screw 183 Internal sensor mounting screw D11 Load direction D12 Front direction P11 First mounting position P12 Second mounting position X11 axis center

Claims

[Claim 1] A load application unit that applies a test load in a predetermined loading direction, A load detection unit holds the test specimen between itself and the load application unit in the aforementioned loading direction and measures the load transmitted from the test specimen that has received the test load, A calibration device in which, in a calibration state set in place of the aforementioned test specimen, the load applied by the load application unit as the test load, and the load detection unit detects the load at that time as the calibration load, A load receiving member is attached to the side of the tester in the load detection unit in the aforementioned test state, and receives the test load and transmits it to the load detection unit. The load-receiving member and the testing device are opposed to each other, and an intermediary member is formed separately from the opposing member. In the testing state, the intermediary member interposes between the load-receiving member and the testing device, with a convex curved surface constituting a part of the sphere facing the opposing member, thereby mediating the indirect transmission of the testing load from the testing device to the load-receiving member. If the opposing member is only one of the load-receiving member and the testing device, the opposing member, as one of the members, is provided with a flat surface that directly contacts the convex curved surface or indirectly contacts it with an intervening object in between. A load testing machine with a calibration device, characterized in that, when the opposing members are both the load-receiving member and the calibration device, one of the opposing members is provided with the flat surface, and the other opposing member is provided with a concave surface into which the convex curved surface fits. [Claim 2] The load testing machine with a calibration device according to claim 1, characterized in that the flat surface is a hardened surface that is harder than the interior of the opposing member on which the flat surface is provided, and the convex curved surface that abuts the flat surface. [Claim 3] The load testing machine with a calibration device according to claim 1, characterized in that the opposing member having the flat surface has a projection that protrudes toward the convex curved surface, and the flat surface is provided on the side of the projection that faces the convex curved surface. [Claim 4] The sheet member is further formed in a sheet shape from a material that is more flexible than both the flat surface and the convex curved surface, The load testing machine with a calibration device according to claim 1, characterized in that the convex curved surface indirectly contacts the flat surface by sandwiching the sheet member as an inclusion between it and the flat surface. [Claim 5] The load testing machine with a calibration device according to claim 1, characterized in that the intermediary member is formed spherically separately from both the load receiving member and the calibration device, and in the calibration state, a part of its surface becomes a contact convex curved surface that directly or indirectly contacts the flat surface, and the other part becomes a fitting convex curved surface that fits into the concave curved surface. [Claim 6] The load-applying portion is formed in a columnar shape having an axis along the loading direction, and has a columnar portion whose one end face is a setting surface on which the test specimen or the calibration device is set. A first acceleration sensor that can be mounted at any position on the set surface, including a first mounting position intersecting the axis, and measures acceleration when a dynamic load is applied, A second acceleration sensor is mounted at a second mounting position located on the axis inside the columnar portion, away from the set surface, to measure the acceleration when the dynamic load is applied. The load testing machine with a calibration device according to claim 1, further comprising the features described above. [Claim 7] The load-applying portion is formed in an annular shape and mounted on the setting surface of the columnar portion such that the center of the ring is located on the axis, and further comprises a mounting member on the mounting surface opposite to the setting surface on which the test specimen or the calibration device is mounted. The load testing machine with a calibration device according to claim 6, characterized in that the mounting surface of the mounting member has a wire guide groove formed in the shape of a groove from the inner edge to the outer edge, which guides the sensor wire extending from the first acceleration sensor to the outside of the mounting member when the first acceleration sensor is mounted in a position where the sensor wire passes inside the mounting member.

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